Portable-track wheel.



C. E. JOHNSON.

-PORTABLE TRACK WHEEL.

I APPLICATION'FILED AUG.29, 1916. 120,85.

Patented Mar. 27, 1917.

2 SHEETS-SHEET I.

C. E. JOHNSON.

PORTABLE TRACK WHEEL. APPLICATION HLED' Aue.'29, 191s.

Patented Mar. 27, 1917.

2 SHEETS-SHEET 2.

rarrnnr CARL n. aonuson, or sr. PAUL, m nunsora.

PORTABLE-TRACK WHEEL.

4 Specification. of Letters Patent. Patentgd lit-Kay, 2'? 191'?Application filed August 29, 1916. Serial No. 117,497;

To all whom-it may concern:

Be it known that I, CARL E. JOHNSON, a citizen of the United States,residing at St. Paul, in the county of Ramsey and State of Minnesota,have invented certain new and useful Improvements in Portable-Track\Vheels, of which the following is a specification.

This invention relates to a portable track Wheel of the traction type,and the object of the invention is to improve upon wheels of this typeby so arranging and connecting the blocks that the wheel will preserve alevel course passing smoothly from one pad or block to another, withoutany undulating movement of the axle; in which the links are so connectedto the pads and wheel that the pads areat all times in more or lesscontact with the Wheel rim; occupying a position at a tangent to saidrim; and, so linked to the wheel that the links will act as fulcrums forthe Wheel, allowing it to push against the pads, preventing slipping orcreeping of the wheel relative to the pads, and insuring positivetraction.

l/Vith these various objects in view th invention consists in the novelfeatures of construction hereinafter described, pointed out in theclaims, and shown'in the accompanying drawings, in which ze- Figure l isa sectional side elevation of a complete wheel.

Fig. 2 is a front elevation.

Fig. 3 is a vertical section on the line 3-3 of Fig. 1, and v Fig. leisa perspective view of a pad and its connecting links.

In constructing my device I employ a double wheel having spokes l andhub 2, said wheel being mounted upon an axle 3 with usual rollerbearings.

Each wheel comprises two spaced rims 4 having inner flanges 5, and pins6 are mounted in and connect said flanges.

The pads 7 are corrugated on their outer or ground faces and on theirinner faces carry rectangular frames 8 in which are mounted transverselypivot pins 9 and 10.

To the latter are connected double links 11, and to the former singlelinks 12, the links crossing and the links 12 working many of the pins 6as there are pads or blocks.

In the wheel illustrated I have shown twelve of these pads but do notdesire to be limited to any particular number.

The length of the pads and links is such that when a pad is brought intocontact with the ground, and two are in engagement with the ground andwith each other at the same time, the wheel can roll, in eitherdirection, the full length of the pad without lifting it, and duringsuch movement the links will act as a fulcrum for the wheel, tending topush the pad downward and in a. direction opposite to the travel of thewheel. This in sures perfect traction and gives pulling power to thewheel, as it is impossible, owing to the mannerof connecting the links,for the wheel to slipon any pad. Intraveling the wheel passes to a pad,the frame 8 act.-

ing as a track, after said pad reaches flat or ground position, travelsthe entire length of the pad' or track portion of the pad, and

track in engagement with the wheel rims,

with the pad at a tangent thereto.

What I claim is:- 1. A device of the kind described com prising a wheel,a series of pads carried thereby, two of-said pads being in simultaneousengagement with the throughout their entire length, and links groundconnecting said pads to said wheel, a link so of one pad having a wheel.connection in common with a link of an adjacent pad.

2. The coinl'nnatmn with a double rimmed wheel, of pins arrangedtransversely between the rims, pads overlapping said rims,

and intersecting links carried by each pad and connected to two of. saidpins, respectively, each pin being pivotally' connected to links ofadjacent pads.

3. A device of the kind described comprising a wheel havlng spared runs.ground pads corrugated on their outer faces and said ,pins, and a singlemetal link carried by the other end portion of the pad and passingbetween said double links and be- 1 ing pivotally connected to anadjacent pin,

as and for the purpose set forth.

In testimony whereof I aflix my signature.

CARL E. JOHNSON.

